Mis-manager implies someone who is not competent in managing or overseeing a certain task or responsibility. Antonyms for mis-manager would be words that describe individuals who are not only good at management but excel in it. Some possible antonyms for mis-manager are responsible, efficient, effective, skilled, qualified, expert, competent, successful, and adept. These words suggest someone who is capable of overseeing and directing a team, project, or business with precision and accuracy. These antonyms highlight the qualities of a good manager, which include excellent communication, critical thinking, leadership, and problem-solving skills.